Quartz crystal. View of a crystal of smoky quartz showing small tourmaline inclusions (dark needles). Quartz (silicon oxide) is colourless when pure,but the presence of impurities can give a range of colours including white,pink,yellow,blue,green,violet and smoky brown,as here. Tourmaline is a complex borosilicate mineral which may also occur in varying colours,sometimes differing even in the same crystal | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Svensson, Kaj R. |
Taille de l’image : | 2690 px × 4055 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |